[GitHub] [arrow] pitrou commented on a diff in pull request #14505: ARROW-16707 [C++] Implement Rank kernel on chunked arrays

[GitBox <gi...@apache.org>]

pitrou commented on code in PR #14505:
URL: https://github.com/apache/arrow/pull/14505#discussion_r1019255519


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cpp/src/arrow/compute/kernels/vector_sort.cc:
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@@ -2078,6 +2078,293 @@ class ArrayRanker : public TypeVisitor {
   Datum* output_;
 };
 
+class ChunkedArrayRanker : public TypeVisitor {
+ public:
+  // TODO: here we accept order / null_placement / tiebreaker as separate arguments
+  // whereas the ArrayRanker accepts them as the RankOptions struct; this is consistent
+  // with ArraySorter / ChunkedArraySorter, so likely should refactor ArrayRanker
+  ChunkedArrayRanker(ExecContext* ctx, uint64_t* indices_begin, uint64_t* indices_end,
+                     const ChunkedArray& chunked_array, const SortOrder order,
+                     const NullPlacement null_placement, const RankOptions::Tiebreaker tiebreaker, Datum* output)
+      : TypeVisitor(),
+        ctx_(ctx),
+        indices_begin_(indices_begin),
+        indices_end_(indices_end),
+        chunked_array_(chunked_array),
+        physical_type_(GetPhysicalType(chunked_array.type())),
+        physical_chunks_(GetPhysicalChunks(chunked_array_, physical_type_)),
+        order_(order),
+        null_placement_(null_placement),
+        tiebreaker_(tiebreaker),
+        output_(output) {}
+
+  Status Run() { return physical_type_->Accept(this); }
+
+#define VISIT(TYPE) \
+  Status Visit(const TYPE& type) { return RankInternal<TYPE>(); }
+
+  VISIT_SORTABLE_PHYSICAL_TYPES(VISIT)
+
+#undef VISIT
+
+  template <typename InType>
+  Status RankInternal() {
+    using GetView = GetViewType<InType>;
+    using T = typename GetViewType<InType>::T;
+    using ArrayType = typename TypeTraits<InType>::ArrayType;
+
+    const auto num_chunks = chunked_array_.num_chunks();
+    if (num_chunks == 0) {
+      return Status::OK();
+    }
+    const auto arrays = GetArrayPointers(physical_chunks_);
+
+    ArraySortOptions array_options(order_, null_placement_);
+
+    ARROW_ASSIGN_OR_RAISE(auto array_sorter, GetArraySorter(*physical_type_));
+
+    // See related ChunkedArraySort method for comments

Review Comment:
   It would be nice indeed. Or perhaps you can even call `ChunkedArraySort` directly?



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